Comparing cone-partitioned plate and cone-standard plate shear rheometry of a polystyrene melt

Schweizer, Th.

doi:10.1122/1.1584428

Cited by 53 publications

(24 citation statements)

References 13 publications

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“…10. Steady second normal stress difference measured at 170 • C using a conepartitioned plate geometry [24][25][26][27]: experimental data (•), XPP ( ), mXPP (+) and Giesekus (×) model predictions. the extensional viscosity growth, it gives poor predictions of the plateau data compared to the XPP and mXPP models.…”

Section: Rheological Characterization and Model Parametersmentioning

confidence: 99%

“…All shear data excluding the second normal stress difference were collected at 170 • C in cone-and-plate geometry (50 mm, 8.5 • ) using a mechanical spectrometer (Rheometric Scientific, model RMS 800) equipped with directly electrically heated tools [24]. The second normal stress difference data were recorded in conepartitioned plate geometry using the same rheometer [24][25][26][27]. All experiments were conducted under nitrogen atmosphere in which our working material was checked to be stable for exposure times of 1 h at 170 • C. The transient and steady shear viscosity data are indicated in Fig.…”

Section: Rheological Characterization and Model Parametersmentioning

confidence: 99%

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Lubricated cross-slot flow of a low density polyethylene melt

Soulages¹,

Schweizer²,

Venerus³

et al. 2008

Journal of Non-Newtonian Fluid Mechanics

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Section: Rheological Characterization and Model Parametersmentioning

confidence: 99%

Section: Rheological Characterization and Model Parametersmentioning

confidence: 99%

Lubricated cross-slot flow of a low density polyethylene melt

Soulages¹,

Schweizer²,

Venerus³

et al. 2008

Journal of Non-Newtonian Fluid Mechanics

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“…The CPP allows one to perform reliable nonlinear shear measurements unaffected by edge fracture on rotational rheometers up to relatively high rates compared to the regular cone and plate. Our home-made CPP was inspired by earlier works [36][37][38][39], and a detailed discussion can be found in [40]. For the specific set of experiments under consideration, the cone angle was 0.1 rad and the diameter of the active plate was 8 mm.…”

Section: B Linear Viscoelasticitymentioning

confidence: 99%

“…The apparent normal stress difference N APP , as measured with the CPP, is not equal to the first normal stress difference N 1 as in a regular cone and plate [36,38]. This will be discussed in more detail in Sec.…”

mentioning

confidence: 99%

“…The apparent normal stress difference N APP , as measured with the CPP, is not equal to the first normal stress difference N 1 but is given by [36,38,39] with N 1 and N 2 , the first and second normal stress differences, R plate , the radius of the active plate of the CPP geometry (here 4 mm), and R sample , the radius of the sample as loaded in the CPP (in this case, the radius of the sample is measured to be 7.2 mm using a caliper after opening the CPP-geometry. This measurement can be done with an accuracy of about 0.1 mm).…”

mentioning

confidence: 99%

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Viscoelasticity and nonlinear simple shear flow behavior of an entangled asymmetric exact comb polymer solution

Snijkers¹,

Kirkwood²,

Vlassopoulos³

et al. 2016

Journal of Rheology

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We report upon the characterization of the steady-state shear stresses and first normal stress differences as a function of shear rate using mechanical rheometry (both with a standard cone and plate and with a cone partitioned plate) and optical rheometry (with a flow-birefringence setup) of an entangled solution of asymmetric exact combs. The combs are polybutadienes (1,4-addition) consisting of an H-skeleton with an additional off-center branch on the backbone. We chose to investigate a solution in order to obtain reliable nonlinear shear data in overlapping dynamic regions with the two different techniques. The transient measurements obtained by cone partitioned plate indicated the appearance of overshoots in both the shear stress and the first normal stress difference during start-up shear flow. Interestingly, the overshoots in the start-up normal stress difference started to occur only at rates above the inverse stretch time of the backbone, when the stretch time of the backbone was estimated in analogy with linear chains including the effects of dynamic dilution of the branches but neglecting the effects of branch point friction, in excellent agreement with the situation for linear polymers. Flow-birefringence measurements were performed in a Couette geometry, and the extracted steady-state shear and first normal stress differences were found to agree well with the mechanical data, but were limited to relatively low rates below the inverse stretch time of the backbone. Finally, the steady-state properties were found to be in good agreement with model predictions based on a nonlinear multimode tube model developed for linear polymers when the branches are treated as solvent. V C 2016 The Society of Rheology.

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“Anomalous” Phenomena

2017

Nonlinear Polymer Rheology

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Comparing cone-partitioned plate and cone-standard plate shear rheometry of a polystyrene melt

Cited by 53 publications

References 13 publications

Lubricated cross-slot flow of a low density polyethylene melt

Lubricated cross-slot flow of a low density polyethylene melt

Viscoelasticity and nonlinear simple shear flow behavior of an entangled asymmetric exact comb polymer solution

“Anomalous” Phenomena

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